judge.cases: 添加测试点数量配置不正确的提示

packages/hydrojudge/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.4.12",
+    "version": "2.4.13",
     "os": [
         "linux"
     ],

packages/hydrojudge/src/cases.ts

@@ -272,6 +272,7 @@ function convertIniConfig(ini: string) {
     const count = parseInt(f[0], 10);
     const res = { subtasks: [] };
     for (let i = 1; i <= count; i++) {
+        if (!f[i] || !f[i].trim()) throw new FormatError('Testcada count incorrect.');
         const [input, output, time, score, memory] = f[i].split('|');
         const cur = {
             cases: [{ input: `input/${input.toLowerCase()}`, output: `output/${output.toLowerCase()}` }],